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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87bf766b297c9c6edaefa56e25c4f2fdb698d25da550660caed52ceb5294b7d' 
  AND token = '/fY5YvmjzOFloQyo/2HEnwzCSB0vnnQ63u5Azg4MrNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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