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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb89b2f4286a680e18474d9c50a74dce60699ca75b953c8d1ec1964414ad383' 
  AND token = 'i4I6v6x7SS2V1oL7zYM5JptQnifKL0rBP/D06S2qWzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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