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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9c877fe8af1d5117c224baba6b967882c0276fa9b76513a87d02dfea206d3a' 
  AND token = 'Zt8rTaANXix3hx2GvYwWW5jem2wKMIRJB1kMjc6TOBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}