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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb97884f4208030826581ab3ab60e0469ce919caa0d33e37e64b7b65d4921a1e' 
  AND token = '5XQvQF7f0+I+oOBIaPS22Jhql3vrIHcoPmItNuaPevY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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