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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416b2e32523be4adff0df8bd3ed6e47a33c3554eb40eba020b87793b5d2364c6' 
  AND token = 'lHUh4WMx1UurA1ztI0hFiYgQ6WTB0wNceBK8T17pXGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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