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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ba05e23d7b0498ce6114023bc5b6af1a2601855ea04e569cae71097d9b4eac' 
  AND token = 'WraQvDPQcOXoIzWFYMCqzRHnYgTM+N5GOYzzWhK3G2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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