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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd66a0249f70a8fc57394d2bd30a9e4f3a79a7339aa013615f3ab288b1f6d86f' 
  AND token = 'lfjnnrQilSiq5Fryf/4754tfkN6OweCdw9t0NZSdl5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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