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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faafd5b16f8abfe61830034ce0e1f01ba17df80730a031ff99f20bd0f172725' 
  AND token = 'iabelblg+lWrAACr0DjD/aDYhQ3JWrZjTNo1ycVMxBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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