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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc974ebe3f6fcaf2817f5bd383fdbccf911bc68754796a62af5af6eaed910b73' 
  AND token = '/EC/58L08PxNOf8Ni/yfOD/jz9lJKZUolyETdeZuTtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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