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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1687a49421a4a44f47b3a4f980305990b419586910e132a775d8b8e86f02b77' 
  AND token = 'X5yPQyuSkll++W/ec8J3S1bSErjKd0uyO4+jJ6iht/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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