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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764ef7137937f9723065243e6c8d37716a0ff7ab0e76e190bcc1c9d6845f3e43' 
  AND token = '/YhA/HPonpK7TEI/k9f66n8NdBlQYjvyHQWptarWezs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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