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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb9e17bc9c8e64b9639f80da70fedc9d150b7c0b68172b37117d23d42502ff3' 
  AND token = 'urT1cWkcM8N1u+mbVjY1giaxwZ0s+dFuc+CJZHfjJzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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