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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7d3584593aa195b60124cd7edd16956cfe0cac9c1d032370584d72ba8317ab' 
  AND token = 'ns58q2JUQ08rcv4cYDVI83sVq4BJkemYB919rV809ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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