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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb51a314d355230442a67c56cca7f6309986f01638fe03067243110890e8c6f2' 
  AND token = 'bwp76p9cpzkZSYNu0xnW5o7v+o32XiszLqDrXY4Uo6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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