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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959e953757c2c90ef4f0d9dc492f2b629544196e32304809f0c835047f818e55' 
  AND token = 'T06a3zNGR9LVO0oMmtipo2MihDWKPqmgjo5NgGZwQOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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