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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c940a0d3c13ecf176ba13d64c134ec612bbbcf0f375e8920f54f2293bbf2c7bb' 
  AND token = 'JVwqMXXC2JDMbTpuBo70JoHOj4/ytMrr0rPYTEP0RlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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