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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac772a576a3a139596fe31437cfdbbefb624de0df504d7b698d0413ec3d315c' 
  AND token = 'C3WNRAP4X2mZ0jnY0vwn/nUD9jLq7OBqOBxB1oIXkHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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