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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372b3fe54d664b0803e3e2f7d26428fbeb480ce010ce945774f7dc83be5896fa' 
  AND token = 'Vki2XfkF3BDZ6p3Xz4Ab0ddjrbu9I6vY61zt5J/ElCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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