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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba9bc596353fa826ff7ebb3066e0e8eb76faa561b6bf58f4ef6c81f17635a90' 
  AND token = 'gl+rFkrFTLOqiYLbnjUoiAEoRd6FrhQjf/rAB8+pR34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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