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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef8adba8af5b69e4aab2090a61d0d785574e9ed0d2c50a4ec4f49c7da94f016' 
  AND token = 'Az/cfl4tL1cix71zZ1oY+8v5Bkylw9FnS94dFPByz6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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