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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3b06c0b8af6edb2e9668dc328b1f70e06af035bb2c33a02433ebf46d3cdc93' 
  AND token = 'IveVEBq3GHmgsFBdkvqxrsOIcuq0VfNVWO7dAbJAncw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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