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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2de58e0efa93c2ffa1bcd9f5d0604bfd462e8da2a2cdb6a452e2d34c0602e4' 
  AND token = 'h8ZknFH6ulmWZge43C+uNFB17Z+e9VoStNWEiWcnzeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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