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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cac5a1088d744fd06c77e7022161238e6b167e7c94bdab739a58cc72ac2f6b' 
  AND token = 'YIuTfhKWuIkam6ftNngmxRDr6/r2mrN70AETyLYNKKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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