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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c89d46af5f9fc7c4c263798a517be3b08c7a4b61786505e9505cfdaa633d2d' 
  AND token = 'b2rIlHQSUck5o8xT2v98uw+OLJ371NSw7+ecGqFoJkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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