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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8bdfeadaae67d4fe97a4f6d37a6bb685cb9c8a4d1f4f53f284a39c1f09d3c5' 
  AND token = 'dFi7khsAZpQB4V2jOrveuaaqqteQ/2dDUKwRapwjLKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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