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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9327b376f2231b577da4829fe49fcb98a2d7e11ed51a9e65380c83b3652a96' 
  AND token = 'BOCQQLSiklWOBi0fV6h8uNA9o96UkC7e7FE1nCnRkuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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