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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3923e0008cce2615a99cae4d5314374045d531bcc234a708d120e99987014f' 
  AND token = 'pEbkm2aRHjdABcjFcn0w3cj8Dm5HgstZu1Nv4zrGCCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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