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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b57a71093b01324d98d6e6684809303721c249fedce61fa8accadfb0d75b6c0' 
  AND token = 'W2yuosp0Nqe4Bf2Wv/ovUirrOc8OeF0eMEf4kZg2RnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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