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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b1da113486c64ff0fa8ce3e8e7d166e25fab8c504ba3aeacf71e2a763844c4' 
  AND token = 'AG06l57DsEw3iifN8avD3ex+Bo83YvXlXXB4gqznBbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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