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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06aaf9d134007b72bbc6b6f3b9f28a8144cc4f89fd7b56f98fb4a85f8c3c52c3' 
  AND token = 'y+LX6pxxuVu1Ks+NcQI4Tx6B78jJir3d6jty5qy0PW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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