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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820b9c4e6e9cd9a7f77d4c8cac1891f0e4f1143c6e54a9bb13b6738d7581ee00' 
  AND token = '/PLK+6AMYzYwNxoMbQgreogdvVQr4dQ4XqVQI0JB+nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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