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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea602b9072746d98bcec4f0962e5930161e9183092107a78d904179efd1e0097' 
  AND token = '3ksjOlPaXEKvBe491K5vLSFXeUUtgBt3JqqcgR8ieCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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