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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da417bc2943f5a077019967515382dd089ee0d1876f37458d898d435f29b8eb3' 
  AND token = 'fTdD8feSEu61z5L9OwxJ+JTMWTFG9gLaQoV/pCUQGdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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