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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5fb0933139bc6ac08c49e76f098e485248024c5d8d6e56cdcc352a2c66769d' 
  AND token = 'oXkeQdiLvItAOjrmc3s7YMXsGyhaIdCWSK3t4SRh5sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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