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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1098689ff15ab1610d919c01e35d0f5b93dfc22f3ee0e2941c37a5f8fd947c' 
  AND token = '6m83gzogGw1UaQbmxwpk4n6T2etxjXMgdiwDstp1EMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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