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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6823fac0ebc356212448533a686f035c3ec6846c37d2bfd675fa669cfe8e78' 
  AND token = 'jVIBfrWX2YuRWC6H83gwzxiPaivYa9KQnniwpW0waLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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