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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1f687b9e7815b3f83c1f9956516c3b050e5fc58adc1a2710967e8d4348dc2e' 
  AND token = 'ro4ypwjalyZBoHHEINH+LBk9E8Kwk0mEWhpBJ9S3ALY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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