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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb76eba7123f879e2c9f9399a0202d5ce9b811cdfe0b8b74b73b4d862a311335' 
  AND token = '35o1g7TQhryF5Ygbo3m4ClmT6OkKG3UXxK6o3lB9irQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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