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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bb401160b29e10699e3d4abfe6ae7eabc4ff2d00d5b9947fc7fd2714d1b097' 
  AND token = 'vis94FKsZdcqW37GTP4iVUkfqo+/TeJOMusXJJbjSBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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