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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c911d295baf797625c06a62ca65e17614d4769f207d8656945762f7a3bad61' 
  AND token = '60FaMR6Q47lCRaYG4gxtMi6nr3hyBL6HXzIUhH/w1g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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