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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58aae4634138c6799ac8507328e718546ff583bea0485c2e042e4144f0dd288' 
  AND token = 'UptJQdWaI9tIF8KQ4WLJBHCNSFM0ik3eT7MYVdFrnE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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