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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90056e186990449df5a8ef3676bb010b88732a4d779180d80b6f80936ab4e3bc' 
  AND token = '5Hqpe/+BnerUId8IhaiWoBkVHBJQDw0y06k4TRWDyaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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