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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65359f96feb6c9b0234010389dedf0339fae1ec5134937ba0c451937b7a4bd1' 
  AND token = 'oK1e5DrTywW3kMLvBP+zwaOyejhMt2TtJRFUL/QbnYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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