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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00e49541d73cace7fb6b614401d75ac90c0790de39d760a8cda1e2479c25f0e' 
  AND token = '4wqM8yClDWMNzSkWUcnAqasad6F/g2jYjXkw9euxg9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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