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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292e0c4dd461474d6bf64dc981ab25a1ac34d59134f42f955a882bc6d9952299' 
  AND token = 'shr2J47sRhclJ375NOdpB2GNVAM/FU+zL3SlJfFpwIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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