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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7385ccb8ae853a521de59e0b2a662e6667ff2547765db73a013e48cfc53d5eb5' 
  AND token = 'C+n0s1g5AdguSJj6D/kr7J3mmmySb39T2tmAF/x5C28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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