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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c137a21e2d2c9cd2da162dc0f1bdb45321bf925aa6149cef06f02a1ce7494d' 
  AND token = 'DTtFK7vS66rglx+CjFSgvy2jl7QL9TtjPx5XPli4O1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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