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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff39c3382fe8f0471f290cf5aaf4ed4d3d1d903d9e3f5a18d89f9abcef693dcc' 
  AND token = 'p3SNrp/7S7EYTrBzUEknf261wM989TLZw22Z6O6IhSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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