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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c02b4c5470348eb4242e5e04731f97c73da613935b85954b6e929d82da083c3' 
  AND token = 'gr0Y+dzFHgkEuuV3lxAOM1C4uLbNCFlhditEoKsymZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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