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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dcdfbebcfa5016ddef84d3028fc72967c62136558cd4e89d4bd0817afd6694' 
  AND token = 'ELsXRrXmW09wTzyKEcyhXSSRC96jVApmBqe8bTfYl24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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