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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ba322df01b32bcff320d01e0a0c2ba1c31eadf9e4282e53a4f2a25b8530758' 
  AND token = 'cOjbNPyabdbAWRnnTLKVTI78CyUSap977oFuyvVi93E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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