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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee06d1a17fe9725575e49de7274e8f81f853c245a4a9a19fdea394e6d00f80f' 
  AND token = '3Ic0mM0EYQFdorxoVP1NyKx2E2iIocovlYC8pgjglaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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