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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42f783ccf8f7bf573cec8069739628743b0241224b22f9c1ac16d0d9ffc34ae' 
  AND token = 'e31O113dJQN3frtut7e4q2NU2AY4LT1xLsk1DUKPAR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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