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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2357513aa16f80a219ce73fab71669647e81ec591682faeec3cd5218a21709c3' 
  AND token = 'e+miPIwXwonArV1LtPnFemoZyxI8RwPJRhkHEHH/KVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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