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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13690e966ddfed607fa0c039709ef5d3d630d4e3c7327468f65e1b1d2525a8f' 
  AND token = 'p3FWAV01/vx+ASNDO1PFP7oywGUZEfglAVotYZAVQ+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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