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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babc4830d511a5b59279b4a6662cc0f6e27801a8c1c46b4409c2258280a329b3' 
  AND token = 'DWiTWAeBkjbgygYgdKeV3KbTqRf8LlapIbeQ84qc+3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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