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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92e2da5ddd36c8b3464f6c6fe22d47d27f3ede13883827de6abd1cfc0b699a2' 
  AND token = 'YBvEckavCZzHO9RheQm+h8xv3+iLX0QNViTOKrEJeWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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