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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c83b924214ebb3809a2c95a3a0f1ae76a44141ef46c85cbf1b9737ae149ea0' 
  AND token = 'mef5eH78R+WAaCT+QiqNEv6d13nt6JikZWLb/qY6Bow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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