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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e8c4c74a27f8cf0459d2faee3912b48122f6d8243551054e6f4c84b61bf10c' 
  AND token = 'vfhHCczuSPx8P3NFy7kNR2wTbTPsp6SvOk0BG/XuTro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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