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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c90c00a6f9c66f05190d94274f1bc392632ab7f4fd3423ef1a7d1fcb64c220' 
  AND token = 'u7qq/e1bZtdYt09Ap1mYHi/Z234ByHbFhv8ScHD6H74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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